A group of women at a prison discover their voices and talents through a choir, led by the former music professor Mun-ok. After years of hard work, they finally get the chance to perform in a national competition, earning praise and freedom to spend time with their loved ones. But their happiness is shattered when Mun-ok is sentenced to death.

Hamoni
In harmony, women from a correctional facility form unbreakable bonds through their shared passion for music, ultimately finding redemption and overcoming their tumultuous pasts.